pollutants of STDS

thank you for helping me! I had a prostitute help me masturbation,and I found that she just did that for another man some minutes before helping me .And her hands still had the man's semen.I wonder if the man had STDS ,and the prostitute used the polluted hands to give me masturbation,was I at risk of catching the STDS? And my doctor told me that I will catch the STDS only if my penis touched the pulluted article just like the pulluted underpants.
Right?

[gracefromHHP]

this is low risk for almost all std's. hpv would be the biggest risk and even that's very low.

we don't recommend any testing from this.

grace